| indebted | (adjective) owing gratitude or recognition to another for help or favors etc | - |
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| (adjective) under a legal obligation to someone | - |
| indecent | (adjective) offensive to good taste especially in sexual matters | - |
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| (adjective) offending against sexual mores in conduct or appearance | - |
| (adjective) not in keeping with accepted standards of what is right or proper in polite society | Synonyms: indecorous, unbecoming, uncomely, unseemly, untoward |
| indecipherable | (adjective) not easily deciphered | Synonyms: unclear, undecipherable, unreadable |
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| (adjective) impossible to determine the meaning of | - |
| indecisive | (adjective) not definitely settling something | - |
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| (adjective) characterized by lack of decision and firmness | - |
| (adjective) not clearly defined | - |
| indecorous | (adjective) lacking propriety and good taste in manners and conduct | Synonyms: indelicate |
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| (adjective) not in keeping with accepted standards of what is right or proper in polite society | Synonyms: indecent, unbecoming, uncomely, unseemly, untoward |
| indefatigable | (adjective) showing sustained enthusiastic action with unflagging vitality | Synonyms: tireless, unflagging, unwearying |
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| indefeasible | (adjective) not liable to being annulled or voided or undone | - |
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| indefensible | (adjective) incapable of being justified or explained | Synonyms: insupportable, unjustifiable, unwarrantable, unwarranted |
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| (adjective) (of theories etc) incapable of being defended or justified | Synonyms: untenable |
| (adjective) not able to be protected against attack | - |
| indefinable | (adjective) defying expression or description | Synonyms: indescribable, ineffable, unspeakable, untellable, unutterable |
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| (adjective) not capable of being precisely or readily described; not easily put into words | Synonyms: undefinable |
| indefinite | (adjective) vague or not clearly defined or stated | - |
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| (adjective) not decided or not known | - |
| indehiscent | (adjective) (of e.g. fruits) not opening spontaneously at maturity to release seeds | - |
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| indelible | (adjective) cannot be removed or erased | Synonyms: unerasable |
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| indelicate | (adjective) lacking propriety and good taste in manners and conduct | Synonyms: indecorous |
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| (adjective) verging on the indecent | - |
| (adjective) in violation of good taste even verging on the indecent | Synonyms: off-color, off-colour |
| indentured | (adjective) bound by contract | Synonyms: apprenticed, articled, bound |
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| independent | (adjective) free from external control and constraint | - |
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| (adjective) (of a clause) capable of standing syntactically alone as a complete sentence | Synonyms: main |
| (adjective) (of political bodies) not controlled by outside forces | Synonyms: autonomous, self-governing, sovereign |
| (adjective) not controlled by a party or interest group | - |
| indescribable | (adjective) defying expression or description | Synonyms: indefinable, ineffable, unspeakable, untellable, unutterable |
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| indestructible | (adjective) not easily destroyed | - |
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| (adjective) very long lasting | Synonyms: durable, perdurable, undestroyable |
| indeterminable | (adjective) not capable of being definitely decided or ascertained | Synonyms: undeterminable |
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| (adjective) incapable of being definitely ascertained or calculated | - |
| indeterminate | (adjective) not precisely determined or established; not fixed or known in advance | Synonyms: undetermined |
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| (adjective) having a capacity for continuing to grow at the apex | - |
| (adjective) of uncertain or ambiguous nature | - |
| (adjective) not leading to a definite ending or result | - |
| (adjective) (of a quantity) having no definite value, as an equation that cannot be solved | - |
| indexical | (adjective) of or relating to or serving as an index | - |
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| indexless | (adjective) lacking an index | - |
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